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Finding the Fourth Proportional to 926.76, 1,278 and 611.40

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Solution

The fourth proportional to 926.76, 1,278 and 611.40 is: 843.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.76 : 1,278 = 611.40 : x
  2. Step 2: Convert to fraction form
    926.76/1,278 = 611.40/x
  3. Step 3: Cross multiply
    926.76x = 1,278 × 611.40
  4. Step 4: Simplify right side
    926.76x = 781,369.20
  5. Step 5: Solve for x
    x = 781,369.20/926.76
  6. Step 6: Final answer
    x = 843.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.